API 11B sucker rod cuplings
Standard: API SPEC 11B
Material: aisi 5140, aisi 4140, aisi 4330
Grade: T, SM, UHS ,K, KD
Sizes: 5/8", 3/4", 7/8", 1", 1-1/8"
Type: full size, slim hole, sub coupling, cross over
Length: 4", 4.5", 5"
Thread: tap extruded thread, 8rd/in, API Standard
Thread Threatement: Phosphating
Surface threatment: Spray metal, or Phosphating
Basic Hardness of steel: HRA 56~62
USE :Well Drilling/Oil planting, oil exploration equipment, accessories, oil sucker rod coupling
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